ok, so today i finally got started on welding my bumper together. i disconnected my (-) on my battery, waited for5 or 10 minuets and then started welding. i only got a few welds i then i had to clean up. so it started up fine and when i was turning it off, i noticed that the check engine light was on but didnt think much of it. after school, i started it again and the light was still on i noticed that my current level was at 11 or 12 instead of the normal 14 volts. any advice on what could be my problem and how to avoid this in the future?

 

anyone